// devnull_kv_engine.h

/**
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once


#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/db/storage/recovery_unit_noop.h"

namespace mongo {

class DevNullKVEngine : public KVEngine {
public:
    virtual ~DevNullKVEngine() {}

    virtual RecoveryUnit* newRecoveryUnit() {
        return new RecoveryUnitNoop();
    }

    virtual Status createRecordStore(OperationContext* opCtx,
                                     StringData ns,
                                     StringData ident,
                                     const CollectionOptions& options) {
        return Status::OK();
    }

    virtual RecordStore* getRecordStore(OperationContext* opCtx,
                                        StringData ns,
                                        StringData ident,
                                        const CollectionOptions& options);

    virtual Status createSortedDataInterface(OperationContext* opCtx,
                                             StringData ident,
                                             const IndexDescriptor* desc) {
        return Status::OK();
    }

    virtual SortedDataInterface* getSortedDataInterface(OperationContext* opCtx,
                                                        StringData ident,
                                                        const IndexDescriptor* desc);

    virtual Status dropIdent(OperationContext* opCtx, StringData ident) {
        return Status::OK();
    }

    virtual bool supportsDocLocking() const {
        return true;
    }

    virtual bool supportsDirectoryPerDB() const {
        return false;
    }

    virtual bool isDurable() const {
        return true;
    }

    virtual int64_t getIdentSize(OperationContext* opCtx, StringData ident) {
        return 1;
    }

    virtual Status repairIdent(OperationContext* opCtx, StringData ident) {
        return Status::OK();
    }

    virtual bool hasIdent(OperationContext* opCtx, StringData ident) const {
        return true;
    }

    std::vector<std::string> getAllIdents(OperationContext* opCtx) const {
        return std::vector<std::string>();
    }

    virtual void cleanShutdown(){};

private:
    std::shared_ptr<void> _catalogInfo;
};
}
